31442200221 has 4 divisors (see below), whose sum is σ = 41922933632. Its totient is φ = 20961466812.

The previous prime is 31442200211. The next prime is 31442200243. The reversal of 31442200221 is 12200224413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31442200221 - 2⁵ = 31442200189 is a prime.

It is a super-2 number, since 2×31442200221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442200211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5240366701 + ... + 5240366706.

It is an arithmetic number, because the mean of its divisors is an integer number (10480733408).

Almost surely, 2^31442200221 is an apocalyptic number.

It is an amenable number.

31442200221 is a deficient number, since it is larger than the sum of its proper divisors (10480733411).

31442200221 is a wasteful number, since it uses less digits than its factorization.

31442200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10480733410.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31442200221 its reverse (12200224413), we get a palindrome (43642424634).

The spelling of 31442200221 in words is "thirty-one billion, four hundred forty-two million, two hundred thousand, two hundred twenty-one".